Regulating feed water for boilers



April 2, 1929. H. A, CTT@ 1,707,639

REGULATING FEEUWATER FOR BOILERS Filed July 2l, 1923 4 Sheets-Sheet l O :92km D v l=1 :f

he D n 4 N 'dl g m /l N l la 5S a" @mbg/w April 2, 1929. H A OTTO 1,707,639

REGULATING FEED WATER FOR BOILEHS Fil July 2l, 1923 4Sheets-Sheet 2 z3? u) I 6') I rfb?, N 1 N w Q i @g M f H f s H L z l il; l 'Q FIC-LZ.

April 2, 1929. H. A. OTTO 1,707,639

REGULATING FEED WATER FOR BOILERS Filed July 21, 1925 4 sheets-sheet 3 April 2, 1929. H A, QTTO 1,707,639

REGULATING FEED WATER FOR BOILERS Filed July 2l, 1925 4 Sheets-Sheet L1 @mav Patented Apr.. 2, 1929.

FIC E HARRY A. OTTO, F PITTSBURGH, PENNSYLVANIA,

0F DORHONT, SYLVANIA.

ASSGNOR TO JOHN H. HOPWOOD,

REGULATING FEED WATER FIOR BOILERS.

Application led July 2l,

The invention described herein relates to improvements in mechanism for controlling the feed of water to boilers and has for its object the provision of means whereby the rate of flow of water will be varied b and in accordance with the change of leve of the water in the boiler below and above a predetermined normal level. The invention is hereinafter more vfully described -and claimed.

ln the accompanying drawings forming a part of this specification, Fig. 1 is a side elevation of a feed water mechanism for boilers embodying the improvement claimed herein;

" Fig. 2 is a sectional View on a plane indicated by the line II-II, Fig. 1; Fig. 3 is a plan view of the thermostatic mechanism controlling the operation of the feed water mechanism; Fig. 4 is a sectional view on an enlarged scale of the pilot valve mechanism, the plane of section being indicated by the line IV. IV, Fig. 2; Fig. 5 is a transverse section on a plane indicated by the line V-V, Fig. 2; Fig. 6 is a view showing the manner of connecting the thermostatic controller to av boiler; and Fig. 7 illustrates the manner of employing a float for controlling the feed water mechanism.

In the construction shown herein the valve is provided at one end with a nozzle 2 adapted to be connected with a water supplypipe and in its side with a nozzle 3 adapted to be connected with a boiler. This chamber is provided interiorly with a cylindrical lining 4 having ports 5 communicating with a peripheral channel 6 communicating with the outlet port 3, and the shell forming the valve 7 which has one end open, is provided with ports 8 adapted to register with the ports 5 more or less fully dependent on the position of the valve as hereinafter described. The stem 9 of the valve is connected to the rod 10 of the piston 1l in the valve operating cylinder 12.

It will be observed that although the valve 7 is subjected to the pressure of water in the feed line at both ends, the waterflowing to the right hand end through a port `14, said valve will be shifted to the right in a direction to open ports 5, by means of the unbalancing effect of the relatively large stem 9. Since it is an object of the invention to also shift the valve 7 to the left or in a direction to close the` ports 5, by the pressure of water in the feed line, a power cylinder 12 having 192s. smal No. 65am.

its piston 11 connected to the stem 9 is connected as by a port 13 to the feed water line. As hereinafter described, suitable valve mechanism is employed to connect the port 13 with the feed water line, or to permit the 60 escape of water from the cylinder such mechanism being operative by and in accordance with changes of level of water in the boiler. The area of the piston 11 should be made sutliciently greater than the cross secton stem and valve.

rovision is made as hereinafter described for an incremental movement of the valve 70 and such movement proportional to changes in level of the water in the boiler. Itis desirable, however, that the quantity of water admitted to the boiler for such incremental movement should vary with the rating at which the boiler is operated. To this end, provision is made for varying the transverse dimensions of the effective areas of the orts 5. his can be conveniently effected) by axially rotating the valve 7 by means of a 80 lever 14 having one end secured to the piston rod 10, as shown in Figs. 2 and 5. In order to hold the valve in position, provision is made for clamping the lever to a slotted sector l5 having its ends slidably mounted 85 on rods 16 parallel with the piston rod 10.

The flow of water through the port 13 at the right hand end of the valve operating cylinder 12 is controlled by a valve mechanism indicated at A in Figs. 1 and 2 specifi- 90 cally shown in Fig. 4. As shown in Fig. 4, this valve mechanism consists of a shell provided with chambers 17 and 18 and 19, the chamber 17 being intermediate the chambers 18 and 19. The chamber 18 has its port 2O 95 connected to the feed line of the boiler and the chamber 19 has a port 21 connected to the hot well or other suitable receptacle. The intermediate chamber 17 has a port 13vadapted when the valve mechanism is in osition, to register with the port 13 in the vallve operating cylinder 12. The chambers 18 and 19 have ports connected to the chamber 17 ,the flow of water through said ports being controlled by spring-actuated valves 22 and 23, 105 said springs operating to shift these valves to closed position. Stems 24 and 25 project respectively from the valves 23 and 22 into the chamber 17 and bear at their ends against an arm 26 on a shaft 27. It will be clearly 110 seen in the construction shown in Fig. 4 that when the arm 26 is shifted downwardly, the valve 22 will be unseated, thereby permitting water under pressure to flow through the port 20, chamber 18, and port leading to the chamber 17 from which 1t passes through port 13a into the cylinder 12and will force the piston to the left or 1n a direction to check the flow of water through the valve chambers. When the arm 26 is moved upwardly, the valve 22 will be seated and the valve 23 opened, permitting water to How back through the chambers 17 and 19 through exhaust port 21. Pressure bemg thus reduced in the valve operating cylinder 12, the pressure of water against the valve 7 will force that valve to the right or in a direction to permit a freer fiow of boiler.

It is preferred that the regulating mechanism should be so adjusted that the arm 26 should be moved to a position permitting the outlet valve 23 to be closed but without o pening the inlet valve 22, so that the piston and valve 7 will be held in the position to which they were moved. If, however, the water in the boiler continues to drop, the arm 26 will be moved to again open the outlet port and thereby permit a further incremental movement of the valve 7 and piston 11 to the right, thereby peri'nitting an increase in the flow of water to the boiler. As soon as the water begins to risc in the boiler, the arm 26 will be shifted to open the inlet 22 permitting water under pressure to flow into the cylinder 12 and cause a movement of the piston 11 and valve 7 to the left reducing the How of water to the boiler. If in such position of the valve 7 the water rises above the desired level, the arm 26 will be again shifted to open the valve 22 and the piston and valve 7 will be shifted to the left to reduce the infiow of Water to the boiler.

On the shaft 27 whereby the valves 22 and 23 are shifted, as hereinbefore described, is secured an arm 28 as shown in Fig. 1, and

this arm has'its end connected by a link 29 to a rod 3() having one end pivotally connected to a sleeve 31, while its opposite end is pivotally connected as at 32 to an arm 33 on a shaft 34. This shaft 34 is also provided with an arm 35 preferably counterweighted and connected by an adjustable link 36 to feans operative by and in accordance with changes of the level of water in the boiler. lrVhen the arm 36 is permitted to be moved downwardly by the counterweight or otherwise, as the level of water in the boiler rises, the outer end of the arm 33 on the same shaft will be moved upwardly, thereby shifting the rod 3() on its pivotal point and through the mcdium of the link 29 raising the arm 28 so as to shift the shaft 27 in a direction to move the valve operating arm 26 (see Fig. 4) opening the valve 22, to allow water under preswater to the end of sure to flow to the right hand end of the operating cylinder 12, as hereinbefore described; By this admission of water to the cylinder 12, the piston 11 and valve 7 are moved to the left. By this movement of the piston a bar 37 adjustably connected to the end of an arm 38 secured to the piston rod 10 is moved to the left-through the shoe 31, connected as before stated, to the rod 30. As this bar 37 is arranged at an angle to the axis of the piston rod, the shoe and the left hand end of the rod 3() willbe moved downwardly, as in Fig. 1, the rod 30 turning on the pivotal point 32 and by reason of its connection through the link 29 to the arm 28, the latter will be moved down or in a direction to permit of the closing of the valve 22 by its spring, thereby stopping a further flow of water to the right hand the cylinder 12. It will be readily understood that by shifting the angular position of the bar 37 with reference to the axis of the piston 11 and valve 7, the range of movement of the piston before the valves 22 and 23 are shifted, can be increased or diminished as desired. The angular position of the bar 37 may be shifted by any desired adjustment mechanism, such, for example, as an adjusting screw 5l threaded through a lug 52 on vthe bar and is rotatably support-ed in a bracket arm 53 mounted on the arm 33. Collars 51 are secured to the adjusting screw on each side of the arm.

In Figs. 1 and 3 is shown a form of thermostatic device for operating the conipensating valve operating mechanism hereinbefore described. This device consists of a metal tube 39 having one end pivotally connected to a bracket 40, while its opposite end is secured in a. block 41. The latter is also connected preferably by two rods 4t2 to the bracket 4() at a point above the connection of the tube 3S) therewith, said rod or rods being pivotally connected to the bracket and block. The lower end of this tube is connected by a pipe 43 to the boiler at a point below the water level therein, while the upper end of the tube is connected by a pipe 4l to the boiler at a point above the normal water level, so that the lower portion of this tube will contain Water which has had its temperature lowered by radiation to a temperature somewhat lower than that in the boiler, while the upper part will be filled with steam and partake of the ten'iperature thereof. As the water level in the boiler drops, the water in the tube will drop down, exposing a further length of the tube to the higher temperature of the steam, causing an expansion of the tube, such expansion operating to raise the righthand end of the device. As water rises in the tube, the proportion subjected to steam temperature will be reduced and the tube will correspondingly contract and its right hand end drop.

In lieu of employing this thermostatic device, the link 36 may be connected to an arm flow of feed water to the motor, means opera-,

tive by and in accordance with changes of level of Water in a boiler for shifting said motor regulating valve in one direction and means operative by the movement of the motor for reversing the movement of the motor regulating valve.

2. A mechanism for controlling the feed of Water to a boiler having in combination a valve for regulating the flow of Water to the boiler, a cylinder connected to the feed line and having a piston connected to the feed water valve, a valve mechanism, mechanism for shifting said valve mechanism to vary the pressure exerted by the feed Water on the piston and operative by and in accordance with changes of level of water in the boiler, and mechanism operative by the piston for shifting the said valve mechanism to closed position after any predetermined movement of the piston. j

3. Apparatus for controlling the flow of feed water to a boiler, comprising a feed Water line communicating With the boiler, a valve in said line for controlling the flowA of feed Water therethrough, a pressure actuated motor for controlling the operation of said valve, a mechanism movable in opposite directions from aneutral position for controlling the delivery of operating fluid to or from said motor, means responsive in operation to variations in the Water level Within the boiler for actuating said mechanism to admit actuating iuid to or discharge actuating fluid from said motor, and means actuated by the movements of said motor for moving said mechanism to the neutral position on each movement of said motor. l

4. Apparatus for controlling the flow of feed Water to a boiler, comprising a feed Water line communicating with the boiler a valve in said line for controlling the flow o Water therethrough, a pressure actuated motor for actuating said valve, a mechanism movable in two directions from a neutral position to deliver actuating Huid to vor from said motor, means responsive in operation to variations in the Water level Within the boiler for moving said mechanism in one direction or the other from the neutral position, and means actuated by movements of said motor for moving said mechanism back to the neutral position to cut oft the flow of actuating fluid to or from said motor.

5. Apparatus for controlling the delivery of feed water to a boiler, comprising a feed water line communicating with the boiler, a valve located in said line for controlling the delivery of water to the boiler, a motor for actuating said valve, a mechanism movable in opposite directions from a neutral position or controlling the operation and the direction of movement of said motor, means responsive iny operation to variations in the Water level in said boiler, for moving said mechanism in one or the other direction from the neutral position, and adjustable means I actuated by movement of said motor for returning said mechanism to -its neutral position.

6. Apparatus for controlling the delivery of feed. water to a boiler, comprising a feed Water lme communicating with the boiler, a

,valve located in said line for controlling the flow of Water to the boiler, a motor for actuating said valve, a. mechanism movable in opposite directions from a neutral position for controllmg the operation and the direction of movement of said motor, means responsive in operation to variations in the Water level Within said boiler, for moving said mechanism in one or the other .direction from the neutral position, adjustable means actuated by movement of saidmotor for returning sald mechanism to the neutral position, and adjustable means for varying the effective opening of said valve independently of the extent of movement of said motor.

apparatus for controlling the delivery of feed Water to a boiler, comprising a feed Water line communicating with the boiler, a valve located in said line for controlling the delivery of Water to the boiler, a fluid pressure motor for actuating said valve, a mechanism movable in opposite directions from a neutral position for controlling the delivery of actuating fluid to and from said motor, means responsive in operation to variations in Water level Within the boiler for moving said mechanism in one direct-ion or the other to admit or discharge actuating Huid from said motor, an inclined Way movable by said motor, a shoe mounted thereon and slidable therealong and a system of instrumentalities operatively connected to said shoe and movable thereby to return said mechanism to the neutral position on a determined movement of said motor.

8. An apparatus for controlling the delivery of feed Water to a boiler, comprising a feed Water line communicating with the boiler, a valve located in said line for controlling the delivery of Water to the boiler, a pressure actuated motor for moving said valve, a mechanism movable in opposite directions from a neutral position for controlling the delivery of actuating pressure to and from said motor, means responsive in operation to variations in water level in the boiler for moving said mechanism in one direction or the other, a Way adjustableto different inclinations and `moving with said motor, a shoe slidably mounted on said way, and instrumeutalities operatively connected to said shoe and movable thereby to return said mechanism to the neutral position on-movement of said motor. 9; Apparatus for controlling the delivery of feed Water to a boiler comprising a feed Water line communicatingwith the boiler, a

control valve located therein and movable m,

feed

one direction by the pressure of the water thereon,l a Water motor for moving said Nny hand.

valve in the other direction, a valve mechanism for controlling the delivery of feed- Water to and from said motor and inclu-ding an instrumentality movable in opposite d1- rections from aneutral position to actuate said valve mechanism, means responsive in operationA to variations in water level Within the boiler for movin said instrumentality in one direction or the other, and means operatively connected to said instrumentality and movable by said motor for returning said instrumentality to the neutral position on a determinedmovement of said motor.

In testimony whereof I have hereunto set 'HARRY A. OTTO. 

